But Calvin made it perfectly clear in a follow-up tweet that he wrote the music, produced the track, and that Taylor was the one who initially wanted to keep her involvement private.

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And this is when Calvin got honest and called B.S. on the timing of Tay's official confirmation, suggesting that she was trying to make him look bad in the press by turning the tables after their breakup.

Then, things went even further: Calvin basically said that Taylor's longtime beef with Katy Perry is REAL and suggested she's trying to ruin his career like she tried to do with Katy's — and he's not having it.

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Calvin ended on a positive note, though, suggesting that Taylor focus on her own life because she has an amazing one.

Please focus on the positive aspects of YOUR life because you've earned a great one